Designing of some platinum or palladium-based nanoalloys as effective electrocatalysts for methanol oxidation reaction

PtSn Nanoalloy Thin Films as Anode Catalysts in Methanol Fuel Cells

“…Oxidation of methanol on the surface of Pt-based electrocatalysts has two main steps: (i) a fast step that contains inner-sphere electron transfer and known as dehydrogenation step, and (ii) a rate-determining step that contains electrochemical oxygen transfer reaction and known as oxidation step . The oxidation mechanism is as follows (eqs –): The overall reaction is According to studies on Pt-based electrocatalysts as well as our good experience in this field, ,, most of the poisoning species are carbon monoxide. At the beginning of this field or even when catalyst composition was new, researchers used gas chromatography to detect the result of methanol oxidation or find a mechanism. , Now, the most aspects of this field on Pt-based electrocatalysts are clear, and just finding a new catalyst with low metal loading and effective catalytic activity in addition to high CO tolerance is a challenge.…”

“…As is obvious in the case of all the as-synthesized electrocatalysts, the current is rapidly decreased, which is related to the carbon monoxide formation during the process of methanol oxidation. Long-term poisoning rate δ is applied to confirm the stability of the as-synthesized electrocatalysts from the linear decay of the current measurement for a period of more than 500 s using chronoamperometry curves and eq : In this equation, J 0 is the initial current density, easily obtained by extrapolating the linear current decay, and (d J /d t ) ratio is the slope of the linear portion of the current decay (Table ).…”

“…The overall reaction is According to studies on Pt-based electrocatalysts as well as our good experience in this field, 61,66,67 most of the poisoning species are carbon monoxide. At the beginning of this field or even when catalyst composition was new, researchers used gas chromatography to detect the result of methanol oxidation or find a mechanism.…”

Testing PtCu Nanoparticles Supported on Highly Ordered Mesoporous Carbons CMK3 and CMK8 as Catalysts for Low-Temperature Fuel Cells

“…Copper nanoparticles were generated either by: (i) constant-potential deposition [26,35,36] or (ii) electroless deposition using reducing agents such as NaBH 4 [37,38], formaldehyde [39], and NaBH 4 or ascorbic acid in water-ethylene glycol mixtures [40][41][42][43][44]. These catalysts were studied to determine their CO tolerance and activity toward the methanol and ethanol oxidation reactions [26,38,39,42,44,45] and the ORR [33,34,40,41,[46][47][48][49]. The PtCu/C catalysts provided ORR specific activities 2-3 times higher than those of Pt/C [47].…”

Co3O4/Ni Köpük Nanokompozitlerinin Doğrudan Metanol Yakıt Hücresinde Elektrot Malzemesi Olarak Kullanımı

“…DMYH'lerin performansını artırmanın etkili bir yolu, yüksek aktivite ve stabiliteye sahip elektrokatalizörler geliştirmektir (Gong et al, 2018). Platin (Pt), paladyum (Pd), rutenyum (Ru) gibi asal metaller ve bazlı alaşımlar metanol oksidasyonu için oldukça güçlü elektrokatalizörlerdir (Hoseini et al, 2018;Waszczuk et al, 2001). Ancak, asal metallerin yüksek maliyeti DMYH'lerin ticarileştirilmesini engellemekle birlikte endüstriyel uygulamayı büyük ölçüde sınırlamaktadır (Ramli and Kamarudin, 2018).…”